
/*
 * Copyright 2011 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
#include "SampleCode.h"
#include "SkView.h"
#include "SkBlurMaskFilter.h"
#include "SkCanvas.h"
#include "SkColorShader.h"
#include "SkGradientShader.h"
#include "SkGraphics.h"
#include "SkImageDecoder.h"
#include "SkPath.h"
#include "SkRandom.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkUtils.h"
#include "SkXfermode.h"
#include "SkColorPriv.h"
#include "SkColorFilter.h"
#include "SkTime.h"
#include "SkTypeface.h"
#include "SkTextBox.h"
#include "SkOSFile.h"
#include "SkStream.h"
#include "SkKey.h"

extern void skia_set_text_gamma(float blackGamma, float whiteGamma);

#ifdef SK_BUILD_FOR_WIN
extern SkTypeface* SkCreateTypefaceFromLOGFONT(const LOGFONT&);
#endif

static const char gText[] =
    "When in the Course of human events it becomes necessary for one people "
    "to dissolve the political bands which have connected them with another "
    "and to assume among the powers of the earth, the separate and equal "
    "station to which the Laws of Nature and of Nature's God entitle them, "
    "a decent respect to the opinions of mankind requires that they should "
    "declare the causes which impel them to the separation.";

class TextBoxView : public SampleView
    {
    public:
        TextBoxView()
            {
#ifdef SK_BUILD_FOR_WIN
            LOGFONT lf;
            sk_bzero(&lf, sizeof(lf));
            lf.lfHeight = 9;
            SkTypeface* tf0 = SkCreateTypefaceFromLOGFONT(lf);
            lf.lfHeight = 12;
            SkTypeface* tf1 = SkCreateTypefaceFromLOGFONT(lf);
            // we assert that different sizes should not affect which face we get
            SkASSERT(tf0 == tf1);
            tf0->unref();
            tf1->unref();
#endif
            }

    protected:
        // overrides from SkEventSink
        virtual bool onQuery(SkEvent* evt)
            {
            if (SampleCode::TitleQ(*evt))
                {
                SkString str("TextBox");
                SampleCode::TitleR(evt, str.c_str());
                return true;
                }
            return this->INHERITED::onQuery(evt);
            }

        void drawTest(SkCanvas* canvas, SkScalar w, SkScalar h, SkColor fg, SkColor bg)
            {
            SkAutoCanvasRestore acr(canvas, true);

            canvas->clipRect(SkRect::MakeWH(w, h));
            canvas->drawColor(bg);
            SkScalar margin = 20;
            SkTextBox tbox;
            tbox.setMode(SkTextBox::kLineBreak_Mode);
            tbox.setBox(margin, margin,
                        w - margin, h - margin);
            tbox.setSpacing(SkIntToScalar(3)/3, 0);

            SkPaint paint;
            paint.setAntiAlias(true);
            paint.setLCDRenderText(true);
            paint.setColor(fg);
            tbox.setText(gText, strlen(gText), paint);

            for (int i = 9; i < 24; i += 2)
                {
                paint.setTextSize(SkIntToScalar(i));
                tbox.draw(canvas);
                canvas->translate(0, tbox.getTextHeight() + paint.getFontSpacing());
                }
            }

        virtual void onDrawContent(SkCanvas* canvas)
            {
            SkScalar width = this->width() / 3;
            drawTest(canvas, width, this->height(), SK_ColorBLACK, SK_ColorWHITE);
            canvas->translate(width, 0);
            drawTest(canvas, width, this->height(), SK_ColorWHITE, SK_ColorBLACK);
            canvas->translate(width, 0);
            drawTest(canvas, width, this->height()/2, SK_ColorGRAY, SK_ColorWHITE);
            canvas->translate(0, this->height()/2);
            drawTest(canvas, width, this->height()/2, SK_ColorGRAY, SK_ColorBLACK);
            }

    private:
        typedef SampleView INHERITED;
    };

//////////////////////////////////////////////////////////////////////////////

static SkView* MyFactory()
    {
    return new TextBoxView;
    }
static SkViewRegister reg(MyFactory);

